Manual adjustment of a back support on a vehicle seat

Abstract

A manual adjustment of a back support on a vehicle seat includes a cable pulley which is selectively rotatable in a drive direction or in a driven direction oriented counter to the drive direction, and a tensile device associated with the cable pulley, which may be rolled up onto the cable pulley by rotating the cable pulley in the drive direction. The tensile device is able to be coupled to a back support of a vehicle seat such that the rotation of the cable pulley in the drive direction and/or driven direction affects an adjustment of the back support. A pretensioning acts on the cable pulley -which produces a torque of the cable pulley in the driven direction.

1. A manual adjustment device of a back support on a vehicle seat, the manual adjustment device comprising:
 a cable pulley selectively rotatable in one of a drive direction and a driven direction oriented counter to the drive direction; 
 a tensile device associated with the cable pulley, wherein the tensile device is configured to be rolled up onto the cable pulley by rotating the cable pulley in the drive direction; 
 a lock configured to restrict the rotation of the cable pulley in the driven direction when in a locked position; 
 wherein in the locked position, the cable pulley is in frictional contact with at least one braking surface of the lock to restrict the rotation of the cable pulley in the driven direction; 
 wherein the tensile device is configured to be coupled to the back support of the vehicle seat such that the rotation of the cable pulley in at least one of the drive direction and the driven direction affects an adjustment of the back support; 
 wherein a pretensioning acts on the cable pulley to produce a torque of the cable pulley in the driven direction; and 
 wherein in the locked position, the pretensioning presses the cable pulley against the at least one braking surface. 
 
   
   
     2. The manual adjustment device of  claim 1 , wherein the pretensioning acts on the cable pulley via the tensile device. 
   
   
     3. The manual adjustment device of  claim 2 , wherein the tensile device is coupled to an element of a lumbar adjustment device for adjusting the back support, wherein the pretensioning acting on the element is transmitted by the tensile device and acts on the cable pulley. 
   
   
     4. The manual adjustment device of  claim 3 , wherein the pretensioning is produced on the element by a resilient tensioning element. 
   
   
     5. The manual adjustment device of  claim 3 , wherein the element is configured as a movable slide. 
   
   
     6. The manual adjustment device of  claim 1 , wherein a rotation of the cable pulley in the drive direction takes place counter to the torque produced by the pretensioning in the driven direction. 
   
   
     7. The manual adjustment device of  claim 1 , further comprising a housing at least partially surrounding the cable pulley. 
   
   
     8. The manual adjustment device of  claim 1 , further comprising a rotatable hand wheel coupled to the cable pulley such that a rotation of the hand wheel causes a rotation of the cable pulley. 
   
   
     9. The manual adjustment device of  claim 8 , further comprising a lock configured to restrict the rotation of the cable pulley in the driven direction when in a locked position, wherein the lock is releasable by rotating the hand wheel in at least one of the drive direction and the driven direction. 
   
   
     10. The manual adjustment device of  claim 9 , wherein the rotation of the cable pulley takes place in the drive direction by rotation of the hand wheel counter to the pretensioning. 
   
   
     11. The manual adjustment device of  claim 9 , wherein the cable pulley is rotatably mounted on a housing about a rotational axis. 
   
   
     12. The manual adjustment device of  claim 9 , further comprising a housing, wherein a counter stop is configured on the housing. 
   
   
     13. The manual adjustment device of  claim 9 , wherein a coupling member is rotatably mounted in a housing about a rotational axis. 
   
   
     14. The manual adjustment device of  claim 9 , further comprising a housing, wherein the housing has a guide for guiding a first stop region along an adjustment path, when the first stop region is slidable along the adjustment path. 
   
   
     15. The manual adjustment device of  claim 14 , wherein the counter stop projects from a guide along the rotational axis so that a second stop region is configured to strike against the counter stop, when rotating the coupling member into the second end position, in order to limit the rotation of the coupling member. 
   
   
     16. The manual adjustment device of  claim 1 , wherein the tensile device is configured as a Bowden cable, wherein a core of the Bowden cable is fastened to the cable pulley. 
   
   
     17. The manual adjustment device of  claim 16 , further comprising a housing, wherein the sheath of the Bowden cable is supported against the housing. 
   
   
     18. A manual adjustment device of a back support on a vehicle seat the manual adjustment device comprising:
 a cable pulley selectively rotatable in one of a drive direction and a driven direction oriented counter to the drive direction; 
 a tensile device associated with the cable pulley, wherein the tensile device is configured to be rolled up onto the cable pulley by rotating the cable pulley in the drive direction; 
 a lock configured to restrict the rotation of the cable pulley in the driven direction when in a locked position 
 wherein in the locked position, the cable pulley is in frictional contact with at least one braking surface of the lock to restrict the rotation of the cable pulley in the driven direction; 
 wherein the tensile device is configured to be coupled to the back support of the vehicle seat such that the rotation of the cable pulley in at least one of the drive direction and the driven direction affects an adjustment of the back support; 
 wherein a pretensioning acts on the cable pulley to produce a torque of the cable pulley in the driven direction; and 
 wherein the at least one braking surface is configured on a housing. 
 
   
   
     19. The manual adjustment device of  claim 18 , wherein the pretensioning places the lock into the locked position. 
   
   
     20. The manual adjustment device of  claim 18 , wherein the lock automatically adopts the locked position when the cable pulley is stationary in a non-actuated position. 
   
   
     21. The manual adjustment device of  claim 20 , further comprising a rotatable hand wheel coupled to the cable pulley such that a rotation of the hand wheel causes a rotation of the cable pulley, wherein the cable pulley is stationary in the non-actuated position when the hand wheel is not actuated. 
   
   
     22. The manual adjustment device of  claim 18 , wherein the lock comprises a further braking surface, the one braking surface and the further braking surface being arranged in a wedge-shaped manner relative to one another, and the cable pulley being arranged between the two braking surfaces, wherein in the locked position the cable pulley is in frictional contact with both braking surfaces. 
   
   
     23. The manual adjustment device of  claim 22 , wherein the cable pulley is wedged in the locked position between both braking surfaces. 
   
   
     24. The manual adjustment device of  claim 18 , wherein the cable pulley has an external surface remote from a rotational axis of the cable pulley, wherein in the locked position the external surface is in frictional contact with at least one braking surface. 
   
   
     25. The manual adjustment device of  claim 24 , wherein the external surface has one of a round and polygonal-type contour in cross section. 
   
   
     26. The manual adjustment device of  claim 24 , wherein at least one of the external surface and the at least one braking surface is of resilient configuration. 
   
   
     27. The manual adjustment device of  claim 18 , further comprising a pretensioning element pretensioned against the cable pulley and pressing the cable pulley against the at least one braking surface in order to prevent the cable pulley from moving out of the locked position. 
   
   
     28. The manual adjustment device of  claim 27 , wherein the pretensioning element presses the cable pulley against a further braking surface in order to prevent the cable pulley from moving out of the locked position. 
   
   
     29. The manual adjustment device of  claim 27 , wherein the pretensioning element opposes the two braking surfaces transversely to a rotational axis. 
   
   
     30. The manual adjustment device of  claim 27 , wherein the pretensioning element is secured to an inner face of a housing opposing the cable pulley and transversely to a rotational axis. 
   
   
     31. The manual adjustment device of  claim 27 , wherein the pretensioning element is configured as a leaf spring. 
   
   
     32. The manual adjustment device of  claim 30 , wherein the pretensioning element is configured as a leaf spring, wherein for securing the leaf spring on the inner face to a first edge region extending along the rotational axis, the leaf spring is inserted into a first groove provided along the rotational axis on the housing, and to a second edge region opposing the first edge region transversely to the rotational axis, the leaf spring is inserted into a second groove provided along the rotational axis on the housing. 
   
   
     33. The manual adjustment device of  claim 18 , wherein an actuation of the cable pulley releases the locked position. 
   
   
     34. A manual adjustment device of a back support on a vehicle seat, the manual adjustment device comprising:
 a cable pulley selectively rotatable in one of a drive direction and a driven direction oriented counter to the drive direction; 
 a tensile device associated with the cable pulley, wherein the tensile device is configured to be rolled up onto the cable pulley by rotating the cable pulley in the drive direction; 
 a stop of the cable pulley; 
 wherein the tensile device is configured to be coupled to the back support of the vehicle seat such that the rotation of the cable pulley in at least one of the drive direction and the driven direction affects an adjustment of the back support; 
 wherein a pretensioning acts on the cable pulley to produce a torque of the cable pulley in the driven direction; and 
 wherein when rotating the cable pulley from a first end position into a second end position for limiting an adjustment path, the stop cooperates with a counter stop being stationary relative to a rotational axis. 
 
   
   
     35. The manual adjustment device of  claim 34 , wherein the stop cooperates with the counter stop via an additional coupling member being rotatable about the rotational axis. 
   
   
     36. The manual adjustment device of  claim 35 , wherein the coupling member has a first stop region being engagable with the stop and a second stop region being engagable with the counter stop, and wherein when rotating the cable pulley in the direction of a second end position, the stop of the cable pulley engages the first stop region, so that the coupling member is driven and the cable pulley and the coupling member are rotatable together about the rotational axis until the second stop region engages the counter stop. 
   
   
     37. The manual adjustment device of  claim 36 , wherein the first and the second stop regions project from the coupling member in opposing directions along the rotational axis. 
   
   
     38. The manual adjustment device of  claim 36 , wherein the first stop region opposes the second stop region transversely to the rotational axis. 
   
   
     39. The manual adjustment device of  claim 36 , wherein the stop projects from the cable pulley along the rotational axis so that, when rotating the cable pulley into the second end position, the stop is able to press against the first stop region of the coupling member in order to drive the coupling member. 
   
   
     40. The manual adjustment device of  claim 35 , wherein the coupling member at least partially surrounds the rotational axis. 
   
   
     41. The manual adjustment device of  claim 35 , wherein the coupling member encompasses the cable pulley in cross section. 
   
   
     42. The manual adjustment device of  claim 35 , wherein the stop cooperates with the counter stop via a plurality of coupling members being rotatable about the rotational axis, one of the coupling members comprising a first stop region cooperating with the stop and a further one of the coupling members comprising a second stop region cooperating with the counter stop. 
   
   
     43. The manual adjustment device of  claim 35 , wherein the coupling member surrounds said rotational axis in an annular manner.